BALiENADiE. 207 



out claws ; hind limbs wanting ; tail terminated 

 by a broad cartilaginous fin, set on horizontally; 

 windpipe opening at the summit of the head by 

 one or two hloic-holes. 



Head enormously large. 



Muzzle rounded ; upper jaw fringed . Balanada. 

 Muzzle truncate ; upper jaw simple . Fhi/seterid<s. 



Head moderate DelpUnidce. 



Family I. BAL^NADiE. 



Head disproportionately large, with a sloping, 

 rounded muzzle ; upper jaws fringed with trans- 

 verse plates of a horny substance [lohalebone) ; 

 both jaws destitute of teeth; blow-hole single. 



Balcenoiotera (Lacep.) Rorqual. A small dorsal 

 near the tail ; throat and belly wrinkled with deep 

 folds. (The largest of known animals.) 



B. rostrata. Fig. 327 ; 3^ n. s. 



327 



Balmia (Linn.). Right-ivMe, No dorsal; belly 

 smooth ; whalebone very deep. 



B. mysticetus. Fig. 328 ; ^lo ^^- ^' 



